Selenocyanids of the anthraquinone series.



permit or cum.

To all whom it mag comm:

Be. it known that I,\LUDWIG Gxrmnmrrn, doctor of philosophy, professor. of chemistry, citizen of the German Empire residing at F-reiburg, in Breisgau, Germany, have invented new and useful Improvements in Selenocyanids of the Anthraquinone Series, of which the following is a specification.

I have found that the hitherto unknown selenocyanids of the anthraquinone series can be obtained by boiling diazoselenocyanids. The reaction proceeds according to the following equation:

The selenocyanids having most probably the formula A-Se-CN (A being the anthraquinone radical) can be split up into selenophenols by means of alcoholic caustic soda lye. The new products are-to be used for the production of dyestufis and of pharmaceutical products.- i

In order to illustrate the new process more fully the following examples are given, the parts being by weight:

Example 1: 2.2 parts of l-aminoanthraquinone are diazotized in concentrated sulfuric acid with nitrosylsulfuric acid. On dilutin with ice the diazosulfate is precipitate d. It is filtered ofi, dissolved in water and mixed with an aqueous solution of 1.5 parts of potassium selenocyanid. A red selenocyanid is precipitated, which already in the cold loses part of nitrogen. In order to complete the reaction the mass is heated until the development of nitrogen .ceases, a crystalline bright orange colored precipitate of 1 selenocyananthraquinone being formed It crystallizes from nitrobenzene in yellow-red needles (melting point 249 (3.).

' By treating the l-selenocyanid of anthraquinone with alcoholic potash a dark green solution of the selenophenolate is obtained from which the selenophenol. having most probably the formula 0 E 0 SeH is precipitated by acidulating the solution. It crystallizes from glacial acetic acid in the Application alga h a, ma. se mno. "aces.

zuowi'eimmr ,or ramvae, m mama-11.1mm

' vomr. rmnn. ram is 00.,- or nmmmw;j ;Gm A C 5 SELEIIOCYANIDS OF THE I shape of orange-red leaflets melting at 212 C. It dyes wool in orange-redshades.

Example 2 3.4 partsef 1-amono-5-anthraquinone sulfonic' acid (s odi'um salt) are diazotized in concentrated sulfuric acid with nitrosyl sulfuric acid. By diluting with ice the" 'diazosulfate is precipitated. It is filtered 01f, mixed with an aqueous solution of 1.4 partsof the potassium sclenocyanid and heated at first to from 70 C. and at last to boiling, a red-brown solution being obtained a development of nitrogen-taking place. Oncooling yellow needles of the potassium salt of the 1-selen0cyano-5-anthraquinone-sulfonic acid are separated. By

having most probably the formula:

Se.C-N

lowish-red needles melting at 249 0.; being converted into the l-anthraquinone-selenophenol by treatment with alkali which selenophenol dyes wool yellowish-red shades,

substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

LUDWIG GATTERMANN;- WitnesseSz.

FRANCES R. Jnwn'rr, JACOB SCHMIDT.

Specification of Letters Patent. une 24,19,113. i

- i 90 which crystallizes from nitrobenzene in yel- 

